How to administer a HPE FF 5900CP switch without using Management port

Hi Fellows,

We just installed and cofigured two HPE FF 5900CP switches as an IRF. Customer asked us to create this Vlans:

Vlan 220 - Administrative Vlan - 10.41.1.0/25 Gateway: 10.41.1.1

Vlan 224 - Data Vlan - 10.41.1.240/28 Gateway: 10.41.1.241

Customer asked us to configure Adminsitration IP for the IRF switch to 10.41.1.6

By mistake we configured Management port IP address to 10.41.1.6, but when we tried to create Vlan 220 ip Interface address to 10.41.1.1, we got an error message that said the subnet overlaps another subnet. We had to change Management port IP address to 10.41.3.6 and the we could configure Vlan 220 interface ip address to 10.41.1.1.

We continue working on configuring everything else, and we connect a laptop computer in a Vlan 220 port, and using IP address 10.41.1.125, we could telnet the switch by using Vlan 220 Interface IP address 10.41.1.1. Till this point we were fine.

But customer asked us to create a trunk port that permited Vlan 220 and Vlan 224 to connect to their router at IP address 10.40.102.67. We did it, but when we connect the cable from router to IRF switch, we lost the telnet connection to 10.41.1.1. We connected the laptop directly to Management port at 10.41.3.6, using IP address 10.41.3.5 on laptop computer, but we could not ping router IP address 10.40.102.67. We decide to go back to connecting the laptop on a Vlan 220 port, and try pinging the router again, so we configured IP address 10.41.1.125 on laptop computer and we tried to ping router IP address 10.40.102.67, and it was successful. We tried to telnet switch at 10.41.1.1, but it didn't work. Last test was connect the laptop computer in Vlan 224 port, using a valid IP address for that subnet, we could ping the router successfully but couldn't telnet the switch at interface Vlan 224 Ip address 10.41.1.241.

Customer doesn't want to use Management port, they want to administer the switch through a Vlan 220 IP address 10.41.1.6, but how can we do this?, And why we cannot telnet the switch using Vlan interface IP address when switch is connected to the customer router?. Any ideas or suggestions will be very helpful and welcomed.